Rocksteel Armor is a Legendary Mono Earth Armor that was introduced on August 12th, 2014. It is effective against Air Armors, but ineffective against Spirit Armors. It is the first Earth Epic Boss Armor since Kanid's Platemail, released alongside Kanid on May 20th, 2014. This is the ninth Epic Boss armor that beats the Moontide Platemail+ in terms of the Plus Stats.